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Asthma cases in Americans are about 75% higher today than they were in 1980.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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The human body produces and destroys 15 million blood cells every second.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.